Cutting element, tool, and method for producing a helically extending, trapezoidally undercut groove in a cylindrical surface of a bore

Cutting element for a tool to create a helically extending, trapezoidally undercut groove in a cylindrical surface of a bore, with:

• several groove-cutting teeth to create a symmetrically cross-sectioned groove which are arranged according to the division harmonised with the pitch of the groove to be created, and which comprise at least one pre-machining tooth to create and machine a base groove and several trapezoidal teeth following the at least one pre-machining tooth which have a tooth head profile with a cross-section that expands trapezoidally in the vertical direction of the tooth with two flanks delimiting a flank angle for further machining the base groove to a trapezoidally undercut final cross-section wherein
• the groove-cutting teeth have a symmetrically cross-sectioned tooth head profile, and
• the flank angle delimited by the two flanks of the trapezoidally shaped tooth head profile increases from at least one trapezoidal tooth to a following trapezoidal tooth to a defined final dimension.